... ABSTRACT The ultra-deep gypsum-salt rock formation with weak interlayers often has two complicated conditions: blockage and lost circulation, and the window of safe drilling fluid density is narrow. Only by increasing the density of drilling fluid cannot solve the problem of well diameter...

... ABSTRACT Protecting the integrity of the wellbore is a major challenge for the sustainable development of hydrocarbon resources in nitrate formation. In this paper, A numerical model for investigating the effects of casing eccentricity on inclined wellbore integrity in salt-gypsum formation...

... with dolomite as the main component and the other with gypsum as the main component. On the one hand, through mineral composition analysis, the main composition of dolomite sample is CaCl 2 and MgCl 2 . Then the ion concentration of acid rock reaction product solution was tested, the results show...

... hydraulic fracturing mechanism tensile reservoir characterization acoustic emission experiment injection rate matrix entire experiment gypsum fluid diffusivity upstream oil & gas ae event specimen geophysical research gonçalves da silva cloud source mechanism ABSTRACT...

... angles (25°,40°, 55°), two kinds of filling material(white cement, gypsum). The direct shear test is carried out under different normal stresses (30kN,50 kN,80 kN,120 kN). The results indicated that, when the normal stress is low, the peak shear strength of white cement filling and gypsum filling...

... was presented. ABSTRACT: Anisotropy in the mechanical properties f rock is often attributed to layering or mineral texture. Here, results from a study on mode I fracturing are presented that examine the effect of layering and mineral orientation fracture toughness and roughness. Additively m nufactured gypsum...

... in the formation of gypsum karst and oil reservoir acid stimulations. As an initial step to understand groundwater flow and dissolution in fractures and in wormholes, pipe flow is used as a simplified representation of groundwater flow. The extended Graetz solution was developed by Li and Einstein, 2017...

... ABSTRACT: When anhydrite dissolves upon contact with water, the sulphate and calcium ions in the pore water can lead to precipitation of gypsum. This anhydrite to gypsum transformation (AGT) results in an increase in the solid volume by 61% and in a decrease or increase in the pore volume...

... process of rocks containing single flaws and under uniaxial compression. The new contact model was first validated by using it to simulate the experimental cracking process of gypsum containing pre-existing single flaws at different inclination angles. Then the influence of flaw shape (length...

... Abstract Gypsum (a mix of Hydrocal B-11 and Diatomaceous Earth) is used by the MIT rock mechanics group as a model rock material. Unconfined compression tests on pre-cracked specimens with high speed camera observation showed macro-cracking processes of gypsum similar to other materials...

... Abstract: A series of laboratory experiments were performed on synthetic fractures in gypsum and lucite to study the ratio of shear to normal fracture specific stiffness of a single fracture subjected to normal and shear stress. The specimens were made by placing two blocks in contact...

... en-echelon flaw international journal geometry evolution reservoir geomechanics Rock mechanics specimen Reservoir Characterization shear rupture gypsum flaw uniaxial compression Upstream Oil & Gas initiation Coalescence Coalescence Type TWC flaw tip compression stress...

... of identifying the differences between stress and strain fields around the flaw tip, relating the stress and strain fields to crack initiation and propagation, and comparing numerical results with those of tests performed on gypsum and marble specimens. Both stepped and coplanar flaw geometries were studied...

...1. INTRODUCTION Water flowing through fractures in soluble rocks widens these through dissolution, a process known as karstif- ication. Karstic terrain is a characteristic feature in the west of Iran along the Zagros Mountains because of vast areas of soluble rocks such as limestone and gypsum...

... framework (developed for Molded Gypsum and Carrara Marble) except for one new coalescence pattern. The crack initiation stress and the maximum stress were measured for each specimen, and these results are interpreted, also. 1. INTRODUCTION Crack coalescence, which is the linkage of pre-existing flaws...

... ABSTRACT: The use of a high speed video system allows one to precisely observe the cracking mechanisms, in particular if shear or tensile fracturing is taking place. The present experimental study on gypsum and marble specimens confirmed that tensile wing cracks (TWCs) are in most cases...

... Reservoir Characterization phase relation host rock mass reservoir geomechanics transition anhydrite Artificial Intelligence Rock mechanics geochemical phase transition dehydration mineral deformation open system diagram Upstream Oil & Gas bearing rock gypsum rock mass...

...Minimization of Building Heave by Chemically Inhibiting Gypsum-induced Shale Expansion; A Preliminary Report by A. B. Hull, R. D. Cody, S. A. Green Department of Earth Sciences, Iowa State University Ames, Iowa 50011 ABSTRACT Floor heave is a continuing problem in struc- tures built upon black...

... ABSTRACT ABSTRACT The use of rock mechanics techniques in the reappraisal of the mining dimensions of a gypsum mine as it was developed is described. The behaviour of the roof strata, under complex geological circumstances, was identified to be that of the "linear arch" structure...